Lapping machine



A ril 5; 1927. s 1,623,697

7 W. A. OUBRIDGE LQAPP'ING MACHINE Filed Aug. 31, 1925 2 Sheets-Sheet 1v Fig.1- 1mm 24m.

a/ztr I i urn/g the upper and lower cast iron or other suit- Patented Apr. 5, 1927.

UNITED! STATES PATENT OFFICE.

WILLIAM ARTHUR OUZBRIDGE, OF COVENTRY, ENGLAND.

nerzemenacnmn.

Application filed August 31, 1925, Serial No. 53,679, and in Great Britain September 9, 1924.

This invention has-for its object to provide an improved lapping machine of the kind in which the articles to be treated are carried in a holder which is ,movablebetween a pair oflaps. The machine is intended primarily for treating such articles as piston rings, gudgeon pins, valve tappets and other like flat or round articles.

The invention comprises the combination of a pair of rotary laps, and a work holder which is actuated by means arranged out side the laps and preferably outside a tank surrounding the lower lap. 7

Also the invention comprises means for driving the holder actuating mechanism, and the laps, as hereinafter described.

Referring to the two accompanying sheets of explanatory drawings Figure 1 is a side elevation of a lapping machine constructed in accordance with this invention. I i

Figure 2 is a side elevation, and Figure 3 a plan of the laps, work holder, and adjacent parts.

In the machine illustrated at Figures 13,

able aps (1,7) are both rotated in the same or opposite directions. Between them is arranged a work holder 0. The holder shown is in the form of a circular plate provided with a number of circular holes d into which piston ringscan' be placed for treatment between-the laps. For treating gudgeon pins 8. ring with internally arranged pegs is employed for carrying the pins. The form of the treated.

At positions 90 apart a pair of lugs e are secured to the holder and these serve to plate Varieswith the work'lo be connect the holder to a pair of crank pins 7 which are adjustably secured to a .pair of crank discs 1, slots in the upper faces of the latter enabling the throw or eccentricity of the pins f to be varied as required.

The spindle of each crank disc has secured to it a sprocket wheel 12. and these are connected by a chain 2' which also'passes around a driving sprocket j on the spindle of the lower lap.

By means of the crank pins the work holder is reciprocated between the laps and also has imparted to it a circular motion relatively to'the laps.

The crank discs are mounted outside the lower lap and also outside a tank is by whi h the lower lap is surrounded. The

sprocket a belt or any other suitable driving means may be emplo ed. But'in all cases the motion given to tie work holder is both reciprocatory and circular.

In machines of this kind it is desirable to avoid frequent recurrence of the same relative. disposition of the lapsv and work holder, and for this purpose I preferably arrange that the ratio between the sprockets j and it shall differ by a sinall amount from say 2 1. For example, instead of having twenty teeth on j and ten on It the latter might have 'hine or eleven teeth. The laps then make a. larger number of revolutions between each repetition of a particular relationship hetweenthe laps and the holder.

' lVhen the cranks or the like are driven by'la belt, the normal slipping of the beltgives the desired result.

In the machineillustratul motion of the laps is derived from a main shaft 1. This drives the lower lap through bevel wheels an. A pulley n on the shaft l is connected to anotherpulley o by a beltfaud frouuo motion is taken through bevel wheels and and intermediate spindles to the spindle of the upper lap which is carried by a radial movable arm "1'. H a

Having thus described my invention what I claim as new and desire to secure by LetterS Patent is In lapping machines of the character 'described, the combination ,of a pair of rotary laps, a tank surrounding the spindle of the lower lap and projecting above the lower lap, a plate-like work bolder located between the laps, a pair'of vertical shafts journalled exteriorly of the tank, adjustable cranks on the upper ends of the shafts and operably connected with the work holder so as to support the same, and means operating about the spindle of the lower lap and the shafts for rotating the shafts to consequently effect orbital movement of the work holder.

In testimony whereof I have signed my name to this specification.

WILLIAM ARTHUR OUBRIDGE. 

